Roller-ratchet for pulleys, &amp;c.



Patented Nov. 20 1900.

No. 66l,9 78.

e. .E. HALL.

iUNTTEn STATES PATENT UFFICE.

GEORGE E. HALL, OF KANSAS CITY, MISSOURI.

ROLLER-RATCHET FOR PULLEYS, 84G.

SPECIFICATION forming part of Letters Patent No. 661,978, dated November20, 1900.

Application filed January 26, 1900, Serial No. 2,888. (No model.)

To all whom it may concern:

Be it known that I, GEORGE E. HALL, acitizen of the United States,residing at Kansas City, in the county of Jackson, State of Missouri,have invented certain new and useful Improvements in Roiler-RatchetsforPulleys, &c., of which the following is a specification.

The object of this invention is to provide a ratchet of this class ofsimple, strong, durable, and inexpensive construction and which may bereadily assembled or taken apart for repair, replacement, &c., and whichwill operate with a minimum of friction.

My invention consists in certain details in the construction,arrangement, and combination of the various parts of the device wherebythe objects contemplated are attained, as hereinafter more fully setforth, pointed out in my claims, and illustrated in the accompanyingdrawings, in which Figure 1 shows a longitudinal sectional view of apulley having my improved rollerratchet device therein. Fig. 2 shows atransverse sectional view of the same. Fig. 3 shows an enlarged detailsection illustrating the construction, arrangement, and combination withthe ratchet-rollers of the bearing-balls at the ends thereof.

Referring to the accompanying drawings, I have used thereference-numerals to indicate the shaft, to which a disk-shaped hub 11is keyed. Formed integral with one end of the hub 11 is anoutwardly-projecting flange 12, and detachably connected with theopposite end of the hub is a plate 13, secured to the hub proper bymeans of the screws 14B and having its edge projecting beyond the bodyportion of the hub to substantially the same distance as the flange orrim 12.

The reference-n umeral 15 indicates the pulley-rim mounted upon the hubbetween the flange 12 and the plate 13, so as to be capable of freerotation upon the hub within said flange and plate. Formed on the innersurface of the rim 15 is a series of pockets 16. The outer surface ofeach pocket extends substantially tangentially from the hub on which therim is mounted, and at the outer end of each pocket is a space largeenough to admit a roller 17, cylindrical in shape and of a lengthslightly less than the length of the hub. On each end of each of saidrollers 17 is a plate 18, connected to the roller by means of the screws19 and having, therein a bearing-ball 20, the surface of the ballprojecting beyond the plate. These .parts are so proportioned that theballs 20 on the opposite ends of the rollers will just clear the flange12 and plate 13.

In practical use, and assuming that the parts were arranged as shown inthe drawings, it is obvious that when the shaft moves in one directionthe rollers 17 will be forced outwardlyinto the pockets 16, and hencethe pulley-rim 15 willnot'be turned. When moving in this direction, itis obvious that if a slight lateral strain were applied to the pulleythe bearing-balls on the ends of the rollers would engage with theflange 12 or plate 13, and hence prevent friction and wear on theseparts. It is obvious in this connection that if the rollers themselveswere allowed to engage the parts 12 and 13 or if the rim 15 engaged saidparts considerable wear would take place and considerable power he lostby friction. However, by providing bearingballs on the ends of theserollers this wear and friction is obviated. Furthermore, aconsiderableadvantage is obtained by the use of this arrangement over the ordinaryballbearings commonly used in such places in that the parts may bedisconnected and balls cannot then readily be lost, as they are attachedto the rollers, which are large enough to be readily seen. When,however, the shaft is rotated in an opposite direction, it is obviousthat the rollers will be made to bind between the inclined surface ofthe pocket 16 and the outersurface of the hub, and hence the pulley-rimmust be rotated in unison with the hub. Hence a ratchet device isprovided of few parts and in which the wear is reduced to a minimum;and, furthermore, a device of this class is produced at comparativelyslight cost, inasmuch as the pockets for the rollers may be cut on theinterior of the rim from one end to the other thereof that is, they maybe cut on an ordinary planer.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States therefor, is

1. An improved roller-ratchet for pulleys and the like, comprising incombination, a hub 11, having an integral flange 12, a plate upon saidhub between said flanges, there being pockets 16 in said rim, extendingentirely through the rim, rollers in said pockets, ball-holders on theends of the rollers, and bearing-balls in said holders, substantiallyas, and for the purposes stated.

GEORGE E. HALL.

Witnesses:

THOMAS G. ORW'IG, J. RALPH ORWIG.

